Sql的三种嵌套查询例题（sql语句嵌套查询）

本文目录

• sql语句嵌套查询
• SQL 嵌套 循环查询问题
• 用SQL嵌套查询语句查询选修了全部课程的学生的姓名.
• sql中的连接查询和嵌套查询···急用，谢谢
• SQL实验：嵌套查询和连接查询
• 求SQL嵌套查询的练习题，一定带数据表

sql语句嵌套查询

在一个SELECT语句的WHERE子句或HAVING子句中嵌套另一个SELECT语句的查询称为嵌套查询，又称子查询。子查询是SQL语句的扩展，例如下：select*fromtable1wherexhin(selectxhfromtable2)

SQL 嵌套 循环查询问题

select from student where (high= (select max(high) from student) or low= (select min(low) from student))order by desc

用SQL嵌套查询语句查询选修了全部课程的学生的姓名.

需要3张表，学生表student，选课表sc和课程表course，select sname from studentwhere not exists(select * from course where not exists(select * from sc where sno=student.sno and cno=course.cno))

sql中的连接查询和嵌套查询···急用，谢谢

这是一个子查询(查询4)select name,sex,age from student where name in (select name from stuscore where score》=90) order by sex asc情况是这样,不过按"性别"升序排序 不知你有什么意图,没意义啊! 这是一个连接查询(查询3)select name,sex,age from student inner join stuscore on stuscore.sid=student.sid and stuscore.score》=90 order by sex asc

SQL实验：嵌套查询和连接查询

1嵌套:select 姓名 from student where 学号 in (select 学号 from 选课 where 课号 in (select 课号 from 课程 where 课名=’数据库原理’))连接：select 姓名 from 学生 join 选课 on 学生.学号=选课.学好 join 课程 on 选课.课号=课程.课号 where 课名=’计算机原理’2 嵌套select 学号,年龄,性别,系名 from 学生 where 年龄 》(select max(年龄) from 学生 where 系名=计算机系)3 连接select 课名,成绩 from 学生 join 选课 on 学生.学号=选课.学好 join 课程 on 选课.课号=课程.课号where 姓名=’张力’

求SQL嵌套查询的练习题，一定带数据表

sele_tel="select companytel_bumen.bumenname,companytel_number.autoid as delid,companytel_number.name,companytel_number.zhiwu," sele_tel=sele_tel&"companytel_number.zhuangxian,companytel_number.shirentel,companytel_number.neixian" sele_tel=sele_tel&" from companytel_bumen inner join companytel_number on companytel_bumen.bumencode=companytel_number.bumencode" sele_tel=sele_tel&" where companytel_bumen.company=’"&companytelsort&"’ and companytel_number.company=’"&companytelsort&"’ and companytel_number.showtag=’YES’" sele_tel=sele_tel&" order by companytel_bumen.taxisid,companytel_bumen.bumenname,companytel_number.taxisid,companytel_number.addteltime"